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Notebook B
B 36

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I think


Case must be that one generation then should be as many living as nowa
To do this & to have many species in same genus (as is). REQUIRES extinction.b
Thus between A. & B. immens gap of relation C & B. the finest gradation, B & D rather greater distinction
Thus genera would be formed.— bearing relation

aCase] added in balloon in same brown ink as figure
bTo do this...extinction] added in second balloon in grey ink
Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin
Transcription and apparatus © American Museum of Natural History